Shock forming machine



SR SEARCH ROOM Nov. l, 1966 3 282 O88 S. C. JOANNOU SHOCK FORMINGMACHINE Filed Sept. 9, 1965 SUBSTITUTE FOR Mlssme XR N/ i i: r

:I n;- INVENTOR, STEPHEN C. JOANNOU if-l BY 1 sL M4? ATTOR N EY:

United States Patent 3,282,088 SHOCK FORMING MACHINE Stephen C. Joannou,Elberon, NJ., assignor to the United States of America as represented bythe Secretary of the Army Filed Sept. 9, 1963, Ser. No. 307,757 1 Claim.(Cl. 73-71.6)

The invention desc-ribed herein may be manufactured and `used by or forthe Government for governmental purposes, without the payment of anyroyalty thereon.

The invention herein relates to a machine for generating a predeterminedmotion. More specifically the -primary objective of the machine is toimpart a variety of different shaped shock .pulses to `a table orplatform upon which there may be mounted particular components, such aselectronic equipments, that are to be subjected to shock tests.

In the utilization of many electronic equipments it is necessary thatsuch equipments be tested prior to use to determine the degree of shockthat such equipments can be subjected Ito prior to such use.

An important object of the present invention is to provide a machinethat is capable of impar-ting a predetermined shock o-r pulse -to anequipment `under controlled conditions.

Another object of t-he invention is to prov-ide a machine for impartinga controlled shock that can be repeatedly reproduced under the exactenvironmental conditions.

An important feat-ure of the invention is the provision of a machine forthe purpose intended, that is relatively small, stable and has a highdegree of reliability.

The .invention can best be understood from the following description, tobe read in view of the accompanying drawing in which:

' FIGURE l is a side elevational view of the machine, taken on the Iline|1-1 of FIGURE 2, and

FIGURE 2 is an end view, in section, taken on the line 2-2 of FIGURE l.

In the drawings the shock imparting machine is designated generally as10, and includes two pairs of spaced parallel upright support mem-bers12, which are preferably of angle iron configuration. The uprights 12,are rigidly affixed to a supporting base 14. Extending between the base14 and the top of the upright members 12, are brackets 16 which alsoserve to support and rigidly maintain the upright members. Positionedwit-hin the space defined by the upright members 12 is a table 18 whichincludes a top 20 and a rectangular shaped base 22 that is centrallyaffixed to the bottom surface of the top 20 and perpendicular thereto.Rigidly affixed to the respective top and bottom surfaces of the tabletop 20 are eight sets of iden-tical roller bearing assemblies generallydesignated as 24 which serve to per-mit vertical, or up and down,movement of the table 18 but prevent any lateral or sidew-ise movementof the table as hereinafter set forth. For purposes of brevity only oneof the ybearing assemblies 24 need be described. Such assembly 24includes an angle support 26, the base portion of which is rigidlysecured to the table top. The upright portion carries a right angleshaft having rollers 28, 28A affixed thereon in transverse lrelationshipto each other. By such arrange- ICC ment the roller 28 can ride on onesurface of the angle iron upright 12, while the other roller 28A ca-nride on the other surface of said upright. In operative engagement withthe base 22, is a cam assembly generally designated as 30, and includesa pair of rectangular shaped cam plates 32, so disposed that thediscrete plates rare on either side of the base 22 and .in para-llelalignment therewith. Secured to, and extending from the side surfaces ofthe base 22 are roller bearings 34, that ride in mutually opposeddiscre'te disposed slots 36 in the two cam plates 32. The nature lof theslot is critical to the operation of the machine herein, and as can beseen in FIGURE l is, slan-ted, that is, inclined from the Ilead-ing edgeof the cam .pla-te to a point adjacent to the far edge of said camplate. The cam assembly 30 is movable rela-tive to the base 22 and thetable 18 by the following means. Affixed to the cam surfaces facing theluprights 12, are bearing plates, one of which is shown at 38. -Each ofthe plates 38 carry a roller bea-ring 40 that is positionedperpendicular to the plates and 4adapted to ride in an elongatedcarriage assembly 42 which includes upper and llower slotted guide rails44, 46 along which the -upper and lower roller bearings 40 will ride.The cams 32, are 'linked at their bottom edges by a cross bar 48 whichaffords rigidity to the cam assembly and insures uniform m-otion of bothcams. Included in the carriage assembly 42 is a decelerating pis-ton 50which -operates in a manner described in the oper-ation of the machine.A componen-t or equipment to be shock tested is shown in the block 52.

To operate the machine the equipment 52 is afxe-d to the table top 20.The cam assembly as shown in FIG- URE 1 is extended to its extreme.position in the carriage assembly. The cam assembly -is then thrust tothe left as seen in FIGURE l. In its travel along the guide rails 44, 46the roller lbearings 34 affixed to the table base 22 will 4rotate as thecams 32 ride between t-he uprights 12. Due to the upward incline of theslots 36 the table 18 will be raised to a height 4dependent upon theslope of the cam slot. Since the thrust of the cams 32 is very rapid,there will be a resultant very rapid uplift of the table 18 and thecomponent thereon. Such sudden shock will be translated to theequipment. Any conventional thrusting or driving force can be utilizedon moving the cams 32. Thus for example, the cams can be spring loaded,or provided with a pneumatic or propellant device 4to effect theirmovement. The lpiston 50 Will serve as an arresting mechanism to stopfurther movement of the cams after any desired length of travel. It willbe apparent that the slope of the slots 36 in the cam plates can bevaried'to any desired degree to secure greater movement of the table 18and acquire varied pulse or `shock movements.

What is claimed is:

A shock imparting machine comprising a plurality of L-shaped `uprightsfixed-ly attached to a horizontally elongated framework, an equipmentsupport member slidably mounted within said uprights, said supportmember having a surface top and a base portion extending downwardlytherefrom, means affixed to said surface top and in operative engagementwith said uprights to permit vertical movement of said support memberwithin said uprights and restrain the support member from lateralmovement relative to said vertical movement, a `plurality of 3 4 rollerbearings extending perpendiculai-ly from the base References Cited bythe Examiner portion of said support member, a substantially U-shapedUNITED STATES PATENTS cam assembly comprising a palr of elongated platesand a connecting cross 4bar that surrounds said base portion, 31106184010/1963 Befsch 73-71-6 said elongated plates having parallel inclinedslots in 5 OTHER REFERENCES ea-ch of said plates Within which .theroller bearings of said base are engaged, a second set of rollerbearings eX- tending perpendicularly from said elongated plates adaptedto travel in said framework whereby when said cam assembly is rapidlythrust along `said framework said 10 RICHARD C' QUEISSER Pnmmy Exammersupport assembly will be Irapidly elevated. J. JOSEPH SMITH, JR.,Assistant Examiner.

Ailbert and Rogers, Kinematics of Machinery, Wiley and Sons, Inc., NewYork, 1931, pages 125-129 relied upon.

